JPH09280709A - Electronic equipment with cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noises generated from cooling fans by installing the cooling fans in the vicinity of a plurality of high temperature generation parts in an apparatus body, providing a plurality of openings on a wall surface of the apparatus body according to the number of the respective cooling fans, and providing exhaust ducts for directing exhaust streams of the cooling fans to the plurality of openings. SOLUTION: Openings 12a, 12b are provided on a facsimile terminal equipment body 11, and cooling fans 15a, 15b are installed in the vicinity of a fixing device 13 and a scanner 14, which constitute high temperature generation parts. Exhaust ducts 16a, 16b conduct exhaust streams of the cooling fans 15a, 15b to the openings 12a, 12b. Heat generated from the fixing device 13 and the scanner 14, which constitute high temperature generation parts, is drawn by the cooling fans 15a, 15b installed in the vicinity thereof to pass through the exhaust ducts 16a, 16b to be discharged outside the facsimile terminal equipment body 11 from the openings 12a, 12b. Accordingly, noises of the cooling fans will not be released directly from the openings of the equipment body, so that noises can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a cooling fan for cooling the inside of a main body, the electronic device having a cooling fan that reduces noise generated from the cooling fan.

[0002]

2. Description of the Related Art Generally, in an electronic device provided with a cooling fan, the cooling fan is used for cooling a high temperature generating portion in a main body. For example, a facsimile machine as an electronic device is a facsimile machine as shown in FIG. A fixing device 2 and a scanner 3 are present as high temperature generating portions in the apparatus main body 1, and heat from these high temperature generating portions is transferred to the main body opening 1a.
The exhaust flow was discharged to the outside of the main body by the cooling fan 4 provided in the. An exhaust duct 5 branched near the fixing device 2 and the scanner 3 is provided as an exhaust flow path from the cooling fan 4 provided in the main body opening 1a to the high temperature generation site.
By installing one cooling fan 4 in this way, the heat of the high temperature generation site is forcibly exhausted outside the main body,
The internal temperature was controlled so as not to exceed the specified value. During the operation of the main body, preset power is supplied from the power supply unit 6 to the cooling fan 4, and the cooling fan 4 operates.

[0003]

However, in the above-mentioned conventional example, since the cooling fan 4 is installed near the surface of the main body, the noise generated when the cooling fan 4 operates is radiated from the main body opening 1a as it is. However, this causes an uncomfortable feeling for a person in the vicinity of the apparatus body 1.

Further, the temperature conditions of the plurality of high temperature generating portions are not always uniform, and due to the restriction of the shape of the main body of the facsimile apparatus, the shape of the exhaust passage of the exhaust duct 5 for each high temperature generating portion is also uniform. Since it is not always possible to make it possible to make a difference in the cooling efficiency at each high temperature generation portion, and at this time, since it is necessary to determine the air volume of the cooling fan 4 based on the measurement point showing the highest temperature in the main body, Depending on the part where the high temperature is generated, cooling is performed more than necessary, which causes an increase in noise of the cooling fan 4.

An object of the present invention is to solve the above-mentioned drawbacks, and to provide an electronic device having a cooling fan in which noise due to the cooling fan is suppressed and unnecessary power consumption in the cooling fan is prevented. is there.

Another object of the present invention is to provide an electronic device having a cooling fan capable of reducing noise by the cooling fan without limiting the use environment.

[0007]

In order to achieve the above object, the present invention is an electronic device having a plurality of high temperature generating portions in a main body, wherein the electronic equipment is installed near the plurality of high temperature generating portions in the main body. A cooling fan, a plurality of openings provided on the wall surface of the main body according to the number of each cooling fan, and an exhaust duct for guiding an exhaust flow of each cooling fan to the plurality of openings are provided. .

Further, according to the present invention, there is provided a cooling fan installed in the main body in the vicinity of a high temperature generating portion, an opening provided in a wall surface of the main body, and an internal part for guiding an exhaust flow of the cooling fan to the opening. An exhaust duct, and an external exhaust duct that guides the exhaust flow of the cooling fan from the opening to the outside of the main body,
A speaker that outputs a canceling sound that reduces the cooling fan noise of the cooling fan by interference, a unit that detects the vibration of the cooling fan, and the cancel that is output from the speaker based on the vibration value detected by the unit. And an adaptive filter for generating sound.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a facsimile apparatus as an electronic apparatus according to the present invention. Reference numeral 11 is a facsimile apparatus main body, and 12a and 12b are openings provided at the side portions of the facsimile apparatus main body 11. is there.

FIG. 2 shows a first embodiment of the present invention.
The inside of the facsimile apparatus main body 11 is specifically shown. In FIG. 2, 11 and 12a and 12b are the facsimile apparatus main body and the opening shown in FIG. 1, respectively. Reference numeral 13 is a fixing device which is a high temperature generating portion, and 14 is a scanner which is a high temperature generating portion. Reference numeral 15a denotes a cooling fan installed near the fixing device 13, which is a high temperature generating portion.
Reference numeral b is a cooling fan installed near the scanner 14, which is a high temperature generation site. Reference numeral 16a is an exhaust duct that guides the exhaust flow of the cooling fan 15a to the opening 12a, and 16b is an exhaust duct that guides the exhaust flow of the cooling fan 15b to the opening 12b. Reference numeral 17 is a power supply unit that supplies power to the cooling fans 15a and 15b.

Next, the operation of the above configuration will be described.

The heat generated from the fixing device 13 and the scanner 14 which are high temperature generating parts is taken in by the cooling fans 15a and 15b installed in the vicinity of the respective parts, and the facsimiles are discharged from the openings 12a and 12b through the exhaust ducts 16a and 16b. It is discharged to the outside of the device body 11. Here, the cooling fans 15a and 15 from the power supply unit 17
The electric power supplied to b is individually set in advance according to the heat generation amounts of the fixing device 13 and the scanner 14 so that the temperature inside the apparatus main body 11 does not exceed the specified value.

According to this embodiment, since the cooling fans 15a and 15b are installed in the facsimile apparatus main body 11, noise generated when the cooling fans 15a and 15b operate is directly caused by the opening 12a and the opening 12a of the apparatus main body 11. 12b
It is possible to reduce noise because it is not radiated from.

Further, since the electric power supplied to the cooling fans 15a and 15b can be individually set, the minimum air flow required to keep each of them below the specified temperature value in the main body, that is, the minimum electric power. Just set it to a value,
Further noise reduction can be achieved.

(Embodiment 2) A second embodiment of the present invention is shown in FIG.
In the second embodiment, the temperature sensors 18a and 18b are installed near the fixing device 13 and the scanner 14, and the cooling fans 15a and 15b are connected to the cooling fans 15a and 15b based on the outputs of the temperature sensors 18a and 18b. The configuration is the same as that of the first embodiment except that the fan power control units 19a and 19b for controlling the supplied power are provided.

Next, the operation of the above configuration will be described.

First, the temperature sensors 18a and 18b monitor the temperature in the vicinity of the fixing device 13 and the scanner 14, which are high temperature generating parts of the facsimile apparatus main body 11, and input the temperature information to the fan power control units 19a and 19b. The fan power control units 19a and 19b are preset with reference temperature values, and the temperature sensors 18a and 18b
The preset power is supplied to the cooling fans 15a and 15b only when the temperature information from b exceeds the temperature value. Incidentally, the cooling fans 15a and 15b
While the power is being supplied to, the same operation as in the above embodiment is performed.

Here, FIG. 4 shows the power control units 19a and 19a.
4 shows a flowchart of the operation of FIG. 4B. In FIG. 4, temperature information is detected by the temperature sensors 18a and 18b in step S1, and whether the temperature detected in the facsimile apparatus main body 11 exceeds a preset reference temperature. Whether or not it is detected in step S2, if the reference temperature is exceeded, preset power is supplied to the cooling fans 15a and 15b in step 3, and if it falls below the reference temperature, power supply is stopped in step 4.

According to the present embodiment, since the operation of the cooling fans 15a and 15b is controlled by the temperature inside the apparatus body 11, the cooling fan is cooled when the outside air temperature is low and the inside of the apparatus body 11 does not need to be cooled. Since the operations of 15a and 15b are not performed, useless power consumption and noise can be reduced.

(Embodiment 3) FIG. 5 shows a third embodiment of the present invention.
And FIG.

FIG. 5 shows the facsimile machine main body 11 of FIG. 1 with a cooling fan noise reduction device added thereto.
Reference numeral 0b is an external exhaust duct provided on the side of the facsimile apparatus main body 11.

FIG. 6 shows the exhaust ducts 20a and 2 shown in FIG.
0b shows the cooling fan noise reduction device related to one of the exhaust ducts 20a, and the other cooling fan noise reduction device is omitted in FIG. 6 because it has the same configuration, and only one cooling fan noise reduction device is shown. Will be described as a representative.

In FIG. 6, 11 and 20a are the main body of the facsimile apparatus and the external exhaust duct shown in FIG.
Reference numerals 15a and 16a are the cooling fan and the internal exhaust duct shown in FIG. Reference numeral 24 is a vibration sensor as a means for detecting the vibration of the cooling fan 15a. The cooling fan noise 25 generated from the cooling fan 24 is generated by the internal exhaust duct 1
External exhaust duct 20a through 6a and opening 12a
To the speaker 26 installed in the exhaust duct 20a.
Outputs a canceling sound 27 for reducing the cooling fan noise 25 due to interference into the exhaust duct 20a. A residual noise 28 is generated as a result of the interference between the cooling fan noise 25 and the cancel sound 27, and a microphone 29 as a sound collecting means for monitoring the residual noise 28 is provided in the exhaust duct 20a below the speaker 26. Reference numeral 30 denotes an adaptive filter that generates a cancel sound 27 output from the speaker 26 based on the output signal of the vibration sensor 24.
Reference numeral 1 denotes an FIR filter as a means for correcting the electroacoustic system between the speaker 26 and the microphone 29 based on the output signal of the vibration sensor 24, and 32 also includes the detection value of the microphone 29 and the output value of the FIR filter 31. And an adaptive filter coefficient updating unit as a means for updating the characteristics of the adaptive filter 30.

Next, the operation of the above configuration will be described. First, the cooling fan 15a installed in the facsimile apparatus main body 11
The cooling fan noise 25 having a noise component that is correlated with the vibration of the cooling fan 15a generated by the operation of (1) advances to the external exhaust duct 20a via the breakdown exhaust duct 16a and the opening 12a. Next, the cooling fan 15a
Is detected by the vibration sensor 24, and based on the output of the vibration sensor 24, the cancel noise having the same amplitude and opposite phase as the noise component correlated with the vibration of the cooling fan 15a in the cooling fan noise 25 in the adaptive filter 30. 27
Is generated and output from the speaker 26 into the exhaust duct 20a. The output cancellation sound 27 interferes with the cooling fan noise 25, and as a result, the cooling fan noise 25 is reduced. With respect to the interference performed at this time, the influence of the phase shift is smaller in the sound wave having the lower frequency, and therefore, it is effective in reducing the noise component correlated with the vibration of the cooling fan 24 having the relatively low frequency. The residual noise 28 generated as a result of this interference is constantly monitored by the microphone 29.
And is input to the adaptive filter coefficient updating unit 32. The filter coefficient updating unit 32 receives a signal obtained by correcting the electroacoustic system between the speaker 26 and the microphone 29 by the FIR filter 31 based on the output signal of the vibration sensor 24, and the adaptive filter coefficient updating unit 32. Then, based on the detection value of the microphone 29 and the output value of the FIR filter 31, the filter coefficient of the adaptive filter 30 is updated at any time so as to minimize the residual noise 28. As a result, the cooling fan noise 25 can be effectively reduced without limiting the use environment.

In this embodiment, the speaker 26 and the microphone 29 may be provided on the facsimile apparatus main body 1 side.

[0027]

As described above in detail, according to the present invention, since the cooling fan is installed in the electronic equipment main body, the noise generated during the operation of the cooling fan is directly radiated from the opening of the main body of the apparatus. It is possible to realize low noise of electronic devices. In addition, the electric power supplied to the cooling fan can be set individually for multiple high-temperature areas, so the minimum air flow required to maintain each temperature below the specified temperature value in the main unit, that is, the minimum electric power It may be set to a value, and the noise can be further reduced. Also, since the operation of the cooling fan is controlled individually by the temperature inside the device body, the cooling fan does not operate when the outside air temperature is low and cooling inside the device body is not required, resulting in unnecessary power consumption. , Or noise can be reduced. Furthermore, in order to reduce the cooling fan noise, an external exhaust duct is attached to the opening, and a canceling sound that reduces the cooling fan noise is output in the exhaust duct due to interference by the speaker. It is possible to effectively reduce a noise component having a relatively low frequency, which is less affected by the phase difference between the cancel sound and the cooling fan noise, without limiting the environment.

[Brief description of drawings]

FIG. 1 is a perspective view showing a facsimile device as an electronic device including a cooling fan according to the present invention.

FIG. 2 is a layout configuration diagram of a cooling fan provided in the facsimile apparatus shown in FIG. 1 according to the first embodiment of the present invention.

FIG. 3 is a layout configuration diagram of a cooling fan provided in the facsimile apparatus shown in FIG. 1 according to a second embodiment of the present invention.

FIG. 4 is an operation flowchart of a fan power control unit shown in FIG.

FIG. 5 is a diagram according to a third embodiment of the present invention, in which a cooling fan noise reduction device is added to the facsimile device of FIG.

FIG. 6 is a configuration diagram of the cooling fan noise reduction device shown in FIG.

FIG. 7 is an arrangement configuration diagram of a cooling fan of a facsimile apparatus according to a conventional example.

[Explanation of symbols]

 11 Facsimile Device Main Body 12a, 12b Opening 13 Fixer 14 Scanner 15a, 15b Cooling Fan 16a, 16b Exhaust Duct 17 Power Supply 18a, 18b Temperature Sensor 19a, 19b Fan Power Control 20a, 20b External Exhaust Duct 24 Vibration Sensor 25 Cooling Fan Noise 26 Speaker 27 Canceled Noise 28 Residual Noise 29 Microphone 30 Adaptive Filter 31 FIR Filter 32 Filter Coefficient Update Unit

Claims (5)

[Claims] 1. In an electronic device having a plurality of high temperature generating parts inside the main body, a cooling fan installed near each of the plurality of high temperature generating parts in the main body, and the number of each cooling fan on the wall portion of the main body. A plurality of openings provided according to
An electronic device including a cooling fan, comprising: an exhaust duct that guides an exhaust flow of each cooling fan to each of the plurality of openings. 2. A plurality of detecting means for respectively detecting temperatures in the vicinity of a plurality of high temperature generating portions in the main body, and a control means for controlling driving of each cooling fan based on outputs of the plurality of detecting means. An electronic device comprising the cooling fan according to claim 1, further comprising: 3. A cooling fan installed in the main body in the vicinity of a high temperature generation site, and an opening provided in a wall of the main body,
An exhaust duct that guides the exhaust flow of the cooling fan to the opening, a detection unit that detects the temperature in the vicinity of a high temperature generation site in the main body, and the drive of the cooling fan is controlled based on the output of the detection unit. An electronic device comprising a cooling fan, characterized in that the electronic device comprises a control means. 4. A cooling fan installed in the main body in the vicinity of a high temperature generation site, and an opening provided in a wall surface of the main body,
The internal exhaust duct that guides the exhaust flow of the cooling fan to the opening, the external exhaust duct that guides the exhaust flow of the cooling fan to the outside of the main body from the opening, and the cooling fan noise of the cooling fan interfere with each other. A speaker that outputs a canceling sound to be reduced, a sound collecting unit that monitors an interference result of the cooling fan noise and the canceling sound, an adaptive filter that generates the canceling sound, and a unit that detects vibration of the cooling fan. A means for electrically correcting between the speaker and the sound collecting means based on a vibration value detected by the means, and a detection value of the sound collecting means and an output value of the correcting means An electronic device having a cooling fan, comprising: an adaptive filter coefficient updating unit that updates the characteristics of the adaptive filter. 5. A cooling fan installed in the main body in the vicinity of a high temperature generation site, and an opening provided in a wall of the main body,
The internal exhaust duct that guides the exhaust flow of the cooling fan to the opening, the external exhaust duct that guides the exhaust flow of the cooling fan to the outside of the main body from the opening, and the cooling fan noise of the cooling fan interfere with each other. A speaker that outputs a cancel sound to be reduced, a unit that detects vibration of the cooling fan, and an adaptive filter that generates the cancel sound output from the speaker based on a vibration value detected by the unit. An electronic device having a cooling fan.